/*
 * Copyright 2007-2009 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.paoding.rose.web.instruction;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.paoding.rose.web.impl.thread.Path;
import net.paoding.rose.web.var.PrivateVar;

public class RedirectInstruction extends AbstractInstruction {

	private String location;

	private String ctxpath() {
		Path pathResolver = PrivateVar.invocationVariables().getPath();
		return pathResolver.getCtx();
	}

	private String modulePath() {
		Path pathResolver = PrivateVar.invocationVariables().getPath();
		return pathResolver.getModule();
	}

	public RedirectInstruction module(String module) {
		if (module.length() == 0) {
			if (ctxpath().length() == 0) {
				location("/");
			} else {
				location(ctxpath());
			}
		} else if (module.charAt(0) != '/') {
			location(ctxpath() + "/" + module);
		} else {
			location(ctxpath() + module);
		}
		return this;
	}

	public RedirectInstruction controller(String controller) {
		if (controller.length() > 0 && controller.charAt(0) != '/') {
			controller = "/" + controller;
		}
		location(ctxpath() + modulePath() + controller);
		return this;
	}

	public RedirectInstruction action(String action) {
		if (action.length() > 0 && action.charAt(0) != '/') {
			action = "/" + action;
		}
		Path pathResolver = PrivateVar.invocationVariables().getPath();
		location(ctxpath() + modulePath() + pathResolver.getController() + action);
		return this;
	}

	public String location() {
		return location;
	}

	public RedirectInstruction location(String location) {
		this.location = resolvePlaceHolder(location);
		return this;
	}

	@Override
	public void render(HttpServletRequest request, HttpServletResponse response) throws IOException {
		response.sendRedirect(location);
	}
}
